<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>ol4加载百度在线地图</title>
    <script src="../lib/ol4/ol4.js"></script>
    <script src="../lib/bd09.js"></script>
    <link rel="stylesheet" href="../css/ol4/ol.css">
    <link rel="stylesheet" href="../css/main.css">
</head>
<body>
<div id="map"></div>
</body>
<script>

    //+proj=longlat +ellps=GRS80 +no_defs

    const projectionBD09 = new ol.proj.Projection({
        code: 'BD:09',
        extent: [-20037726.37, -11708041.66, 20037726.37, 12474104.17],
        units: 'm',
        axisOrientation: 'enu',
        global: false
    });
    ol.proj.addProjection(projectionBD09);
    ol.proj.addCoordinateTransforms('EPSG:4326', 'BD:09', coordinate => {
        return lngLatToMercator(coordinate);
    }, coordinate => {
        return mercatorToLngLat(coordinate);
    });

    const projectionExtentInBD09 = projectionBD09.getExtent();
    // debugger
    const resolutions = [];
    const maxZoom = 18;
    const minZoom = 0;
    // 计算百度使用的分辨率
    for (let i = minZoom; i <= maxZoom; i++) {
        resolutions[i] = Math.pow(2, maxZoom - i);
    }
    // console.log(resolutions.toString());

    const tileGrid = new ol.tilegrid.WMTS({
        origin: [0, 0],
        resolutions: resolutions,
        extent: projectionExtentInBD09,
        matrixIds: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18]
    });

    const baiduSource = new ol.source.WMTS({
        projection: 'BD:09',
        tileGrid: tileGrid,
        tileLoadFunction: (tileCoord, projection) => {
            debugger
            let [z, x, y] = tileCoord;
            return `http://maponline0.bdimg.com/tile/?qt=vtile&x=${x}&y=${y}&z=${z}&styles=pl&udt=20210407`;
        }
    });
    // 百度地图层
    const baiduMapLayer = new ol.layer.Tile({
        source: baiduSource
    });

    const pointList = [
        [108.356016981254, 21.6866684886638997],
        [108.3558891399534, 21.686536030287083],
        [108.3558891399534, 21.686536030287083]
    ];
    const centerPoint = pointList[0]; // 邢台 - [114.507435,37.074612] ; 北京 - [116.384722, 39.889916]

    const circlePoint = ol.proj.transform(centerPoint, 'EPSG:4326', 'BD:09');

    console.log(circlePoint);

    const iconFeature = new ol.Feature({
        geometry: new ol.geom.Point(circlePoint)
    });

    const iconStyle = new ol.style.Style({
        image: new ol.style.Icon({
            anchor: [10, 26],
            anchorXUnits: 'pixels',
            anchorYUnits: 'pixels',
            src: '../image/position_orange.png'
        })
    });

    iconFeature.setStyle(iconStyle);

    const circlePoint1 = ol.proj.transform(pointList[1], 'EPSG:4326', 'BD:09');
    const iconFeature1 = new ol.Feature({
        geometry: new ol.geom.Point(circlePoint1)
    });

    iconFeature1.setStyle(iconStyle);


    const vectorSource = new ol.source.Vector({
        features: [iconFeature, iconFeature1]
    });

    const iconLayer = new ol.layer.Vector({
        source: vectorSource
    });


    const map = new ol.Map({
        layers: [
            baiduMapLayer,
            iconLayer
        ],
        target: 'map',
        view: new ol.View({
            center: ol.proj.transform(centerPoint, 'EPSG:4326', 'BD:09'),
            projection: 'BD:09',
            zoom: 17,
            maxZoom: 18,
            minZoom: 3,
            resolutions
        })
    });

</script>
</html>